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Persistent Saturnian Auroras

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#67751 by @ 23.02.2005 00:00 - nach oben -
Persistent Saturnian Auroras

Are Saturn's auroras like Earth's?

To help answer this question, the
Hubble Space Telescope and the
Cassini spacecraft monitored Saturn's South Pole
simultaneously as
Cassini closed in
on the gas giant in January 2004.

Hubble snapped images in
ultraviolet light, while Cassini recorded
radio emissions
and monitored the
solar wind.

Like on Earth, Saturn's auroras
make total or partial rings around
magnetic poles.

Unlike on Earth, however,
Saturn's auroras persist for days, as opposed to only minutes on

Although surely created by
charged particles entering the atmosphere,
Saturn's auroras also appear to be more closely modulated by the
solar wind than either Earth's or
Jupiter's auroras.

The above sequence shows three Hubble images of
each taken two days apart.

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